Card reader employing stacker with offset memory



United States Patent CARD READER EMPLOYING STACKER WITH OFFSET MEMORY 11 Claims, 5 Drawing Figs.

US. Cl. 209/74; 271/64, 271/71, 271/86 Int. Cl. B07c 3/02 Field of Search 209/74;

[56] References Cited UNITED STATES PATENTS 3,149,836 9/1964 Ragozzino 271/71X 3,291,485 12/1966 Darwin 271/71 Primary Examiner-Richard A. Schacher Attorney-Sughrue, Rothwell, Mion, Zinn and Macpeak ABSTRACT: In a card reader discharging cards into a stationary stacker positioned below and in the path of card movement, the card stacker having a stepped end wall at its entry end and acting in' conjunction with converging sidewall to form two card receiving compartments having angularly offset longitudinal axes with one of the compartments being in line with a normal card path and the other in line with a deflected card path. The card reader is provided with means for selectively deflecting the trailing edge of a card as it leaves the posi-, tive feed means during card discharge. The stepped wall retains the accumulated cards in selected alined or laterally offset positions within the card stacker. The card stacker may be sectional and longitudinally adjustable for use with cards of differing length.

Patented Dec. 1970 3,543,926

Sheet L of? INVENTOR ELWOOD c. CAMPBELL W [M Z4. g; BY ATTORNEYS Patented Dec. 1, 1970 3,543,926

Sheet 3 013 CARD READER EMPLOYING STACKER WITH OFFSET MEMORY BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to card stackers, and more particularly to a feeding mechanism for discharging cards along a longitudinalfeed path from a card reader or the like whereby the discharged cards move forwardly along the feed path and fall by gravity into a stationary stacker located in the path and below the discharge plane of the ejected cards.

2. Description of the Prior Art Card readers have long employed feeding mechanisms which move the card along a longitudinal feed path through a read mechanism in either continuous or incremental fashion with the cards being discharged at a given velocity whereupon they move away from the reader, to fall by gravity into an open top stacker. In general, such stackers are rectangular in plan configuration having right angle side walls and end walls. Card guides or deflectors have been employed for insuring that the cards, as they move in free flight subsequent to discharge from-the reader, continue to move along a path which is alined with card feeding apparatus. The cards are moved serially at highspeed, in either spaced or abutting fashion. One or more of thecards may be deficient either due to faulty card construction, or incorrect information being carried by the cards and one function of the card reader is to select, on the basis of information carried by the card, certain ones of the cards, which are then diverted from the normal card discharge path to a second path for separate card accumulation. Where no alternate path of travel is provided by the card reader, cards which are structurally deficient are accumulated within thesingle card stack, along with the'correct cards in the same order in which they are being read.

SUMMARY or THE lNVENTlON ing mechanisms which employ a stacker characterized by an offset memory. The single stacker, while being generally rectangular in configurationand of the open top type, is provided with a stepped card entry end wall which cooperates with a laterally converging sidewall to form-two separately defined card receiving compartments having longitudinal axes the feed mechanism. Means are provided on the card feed mechanism for laterally deflecting the trailing end of selected cards such that thedeflected cards then continue to move along a discharge path which .is in line'with the longitudinal axis of the second card receiving compartment and angularly offset from the first compartment.

The card stack is thus provided with stepped sidewalls and end walls at the card entry end which occupy different planes and form angularly offset corners for selectively receiving the deflected and undefl'ected cards and retain them in their respective positions during stacking. The distance from the stepped inside wall corners to a common corner diagonally opposite thereto are equal, with the common corner forming the card pivot point. The card stacker may be unitary in form or may be sectional including card leading edge and trailing edge receiving portions. The diverging sidewall of the leading edge section is selectively received within the converging sidewall of the trailing edge receiving portion, allowing adjustable coupling of the portions, whereby; the stacker in shortened form, allows the angled sidewalls to overlap each other without affecting the function of the stepped entry end wall.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a simplified card reader which employs the offset memory stacker of the present invention and includes means for selectively deflecting the trailing end of the card during discharge therefrom.

FIG. 2 is a perspectiveview of the deflecting mechanism incorporated within the card reader of FIG. 1, during card deflection.

F IG'. 3 is a side elevational view of the deflecting mechanism of HO. 2 with the deflector in latched position.

FIG. 4 is a perspective view, a partially in section of .a modified offset memory card stacker, in sectional form, allowing longitudinal adjustment for cards of differing lengths.

FIG. 5 is a side elevational view of the stacker shown in FIG. 4.

DESCRlPTlON OF THE PREFERRED EMBODIMENT Referring to the drawings, card stacker 10 functions in a normal manner, to read columnar information from individual cards moving from stack '12. The cards are fed in serial fashion; from the bottom of the stack, located in card supply area 14 in a direction at right angles to the longitudinal axis of the card as indicated by arrow 16 to card reader area 18. Here the cards are moved along a path in line with the longitudinal axis of the card for reading, discharge and delivery into a specially formed card stacker 20 located beneath and in line with the path of card movement.

The present invention while being incorporated within a card stacker 10 may be applied to any card feed mechanism in which cards are moved in serial fashion for gravity discharge into a card stacker positioned in the path thereof. The illus trated card stacker includes a card feed mechanism employing a pair of reciprocating card feed means 22 driven by a mechanism which oscillates as indicated by arrow 26 to feed the cards singly from the bottom of the stack 12 through a narrow feed throat 27.'The cards move into lateral edge abutting contact with sidewall or plate 28 whereupon, the cards are then moved forwardly at right angles through card reader mechanism 18 and discharged from the card reader, the plane of which may be defined by card 32. Card 32 is shown as moving forwardly while falling by gravity such that it will be received by the stationary stacker 20. The card feed mechanism for reader 10 which selectively causes the bottommost card of the stack 12 to be fed laterally in the direction of arrow 16 and then fed in the direction of arrow 30 through card reader mechanism 18, forms no part of the-present invention andis fully described in copending Pat. application Ser.

N02 782,95l, filed DecLl l, l968.- and entitled "Card'Feeding Mechanism and Feed Knife Therefor" and assigned to the common assignee. i Y

It is important'only to not that asthe cards pass from between plates 34 and .36 of card reader mechanism 18 they pass between a'continuously driven, low friction, eject 'roll 38, and a spring bia'sedpressure roll'40'which tends to discharge the card in direction of arrow 42in the absence of restraint by the card reader, The card sta'cker 20 is characterized by having at least, a stepped entry end wall 44 and a sidewall 46 converging toward the opposite end wall 48 rather than being. at

right angles thereto. The stacker in conventional fashion, is

the plane of stackersidewall 28 and the path of movement as defined by arrow 42 for cards which pass through the card reader without deflection. Thus, card 32 when it is received within the card stacker 20 will have "its leading edge 60 abutting end wall 48 and its trailing edge 62 received within corner 64 of the stacker. Thus card 32 will aline itself with the intermediate portion 66 of the stack of cards already received,

which are angularly offset from the lowermost portion 68 of the stackand those cards immediately above at 70.

It might be stated that the entry end wall 44 of the stacker 20 is provided with a step to form offset end wall portions 72 and 74 and a narrow sidewall portion 76 forming in addition to corner 64, a second corner 78. Likewise sidewall 46 is preferably stepped to form principal sidewall portion 80 which acts in conjunction with narrow sidewall portion 76 to define corner 64. The sidewall 46 is further stepped at 82 along its converging direction prior to forming leading edge corner 86 with end wall 48.

Thus, in the illustrated embodiment of FIG. 1, the stacker forms a first card receiving compartment defined by end wall portion 74, right hand sidewall portion 80, common end wall 48 and common sidewall portions 50 and 52. This compartment receives undeflected cards such as card 32 which is shown as being discharged from the card reader. Deflected cards such as the portion of the card stack 70 already within the card stacker are received within 'a second compartment which is defined by narrow right hand sidewall portion 76 entry end wall portion 72, sidewall portions 50 and 52 and common end wall 48. It may further be stated that the cards must be prepositioned during gravity dropping, into either of the two longitudinally defined'positions since, the diagonal distance D2, from the common pivot point formed by corner 88, between sidewall portion 50 and end wall 48 to corner 64 of the first compartment, is the same as the diagonal distance D1 to corner 78 of the second compartment. Thus, the right angle corner 90 which is formed between corners 64 and 78, cause entrapment of the cards and prevents a deflected card for instance, from moving into'the nondeflected card receiving compartment.

Deflection of the cards from a path of movement generally along the plane of sidewall 46 to an angularly offset plane of movement, defined by'narrow sidewall 76, is achieved by the card reader as is seen in FIGS. 1,2, and 3. In FIG. 3 for instance, card 32' is shown as moving in the direction arrow to a position between incrementing wheel 92 and a cooperating pressure wheel 94 which is carried by a spring biased support arm 96. Arm 96 pivots about the axis of fixed mounting pin 98 and is biased for counterclockwise movement by bias ing spring 100, as indicated by arrow 102. Oscillation of this member is seen by arrow 104, FIG. 3. This counterclockwise movement is prevented by set up arm 106 whose edge or surface 108 abuts the forward end 110 of the pressure wheel support plate. The set up arm 106 is pivotably mounted by pin 112 and includes a detent or latch portion'114 which normally maintains deflector 116 in the full line position shown in FIGS. 1 and 3 and the dotted line position of FIG. 2. Further, a biasing spring 118 is coupled to end 120 of the set up arm for biasing the set up arm in latching position while maintaining the of spring 118 under oscillation as shown by arrow 121. The set up arm actuating bar 122 is pivotally connected to the set up arm at 124. While oscillation of set up arm actuating bar 122 may occur in any conventional manner, the reader employing the deflecting mechanism of the present invention is provided with cam means (not shown) for performing this function. The reader is further provided with a deflector arm 126 which is pivotally mounted by pin 98, at the right-hand end thereof, and is spring biased by coil spring 128 in a clockwise direction about the axis of pin 98. The deflector arm includes a thin projection portion 130 which is received within the recess formed by an ear 132 struck out of deflector 116. Deflector 116 is L- shaped in configuration having a laterally projecting deflector latching portion 134 which abuts the bottom of the set up arm latch portion 114. Thus, in the absence of latching contact between latching portions 134 and114, upwardmovementof the deflector arm causes the deflector 116 to pivot about car 132 with the lower end l36 of the deflector contacting the side of the card, near its trailing edge to deflect the same laterally in its path of movement during discharge thereof, in response to a signal initiating a deflection sequence.

In this respect, the rear plate 28 of the card reader is provided with an L-shaped extension 138, FIG. 1, which carries a pivot pin 140 forsupporting the deflector near its upper end in the vicinity of the struck out car 132. Pivotal movement of the. deflector occurs, in the absence of latching, about an axis which is parallel with the plane of movement of the card being discharged from the reader. It is noted that the pivot point of the deflector is above the plane of card movement to insure" lateral deflection of the card in response to deflection of the deflector from the dotted line position of FIG. 2 to the full line position.

The deflector arm 126 further includes a U-shaped extension 142 forming a contact edge 144which abuts the bottom of the card being fed in the manner seen in FIG. .3. Further,'

lowing the pressure wheel 94 to pivot in a counterclockwise direction into card feed position. A resilient stop 152 is positioned behind the deflector to limit oscillation of the same between deflected and undeflected position. In addition to in- I crement drive wheel 92 and pressure wheel 94, there is also provided, a continuously driven, low friction eject roll 38 which cooperates with spring biased pressure roll 40. When the leading edge 60' of card 32' moves into the nip area between these members, there isa constant tendency for the eject roll to eject the card from the card wheel, but this is overcome by the biasing force existing between the intermit tently moved incrementing wheel 92 and pressure wheel 94.

In operation, cards are moved in serial fashion from the stack of cards 12 along feed path 16 laterally of the stack" to edge abutmentposition with wall 28', and subsequently to the card reader 18 in conventional fashion. The card moves in the direction of arrow 30 by means (notshown) and reaches the position shown in FIG. 3. Leading edge60' abuts card gate stop 148. Upon appropriate signal from the card reader 10, the setup ar'm actuator bar 122 moves from right to left against the bias of spring 118 to cause the set up arm 106 to pivot in'a clockwise direction, moving contact face 108 away from end of the pressure wheel support 96 dropping the pressure whe'el'94 against the top card 32'. The card is thus sandwiched under biasing force from-spring 100, between the incrementing wheel 92 and the pressure wheel 94. Further. rotation of the set up "arm in a clockwise direction causes the card gate "146 to move downward until stop 148 is positioned below card 32'.'At this point, the card-32 is free to move in" increment fashion in response to a normal read function of themachine. It would seem that the deflector arm 126 would tend to rotate in response -to the bias of spring 128 in a clockwise direction to cause deflection of deflector to the full line'positio'n shown in FIG. 2. However, in order for the deflector arm extension to pivot sufficiently to cause the desired deflection, it is necessary for the card contact surface 144 of the U- shaped extension 142 of the deflector arm to pivot upwardly above the plane of card feed and the physical presence of card 3 32' prevents this movement. Note at this instance, with the set up arm having pivoted in a clockwise direction to its fullest exfor reading either 51 or 80 column cards. In any case, under normal machine operation, the cards are incremented the full 80 columns and after reading of the 80th column, a lever (not shown) moves up to indicate to the machine that the full card has been read. or cam actuation by In normal operation, after the 80th column has been read, the trailing edge 154 is still to the rear of the deflecting arm a card contact surface 144 so that the deflector arm is maintained in its nonnal position regardless of release by the detent of latch projection 114. Meanwhile, the leading edge 60' of card 32' has long moved between the continuously moving eject roll 38 and its pressure roll 40. Under normal man machine function, by either clutch actuation or cam actuation by means (not shown) there occurs a movement of the deflector arm actuator bar 122 from left to right in the direction of the bias of spring 118 causing clockwise movement of the set up arm 106. The detent projection 114 moves again over the detent portion 134 of the L-shaped deflector to latch the deflector in its normal vertical position, while surface 108 on the set up arm again lifts projection 110 of pressure wheel support arm 96 to raise pressure wheel 94 from its position of contact with the surface of card 32. Simultaneously, while contact surface 150 of the same arm moves upwardly and while a card gate 148 would normally follow into card abutting position, it is prevented from doing so since the card 32 has a portion inwardly of trailing edge 154 in contact with the top of depressed card gate stop 148. Regardless of the biasing force acting on this card gate tending to rotate it in a counterclockwise direction about pivot pin axis 112, the card gate 146 remains in the position shown in FIG. 3. Upon upward movement of the pressure wheel 94, the normal frictional restraint acting on the card which exists between the incrementing wheel 92 and the pressure wheel 94 ceases. With low friction contact between a continuously driven eject roll 38 and the pressure roll 40, card 32, is discharged in a direction of the longitudinal axis of the card. As trailing edge 154 of card 32' passes over the contact edge 144 of the deflector arm 126, there would be a tendency for the deflector arm to pivot in a clockwise direction under the bias of spring 128. However, the detent or latch 114 now overlies the detent portion 134 of the pivotable deflector 116 and upwardmovement of the deflector extension 130 is prevented by ear 132 receiving the same. Thus, the deflector arm remains in its inoperative position and the gate 146 pivots counter clockwise to move stop 148 into card abutting position after the trailing edge 154 passes over the stop. The undeflected card is discharged as indicated in FIG. 1 with its side edge 156 moving along the plane of sidewall 46 to fall into a stacker com partment defined by corner 64.

The succeeding card moves into incrementing position wherein its leading edge impacts the raised card gate stop 148. It is assumed that the succeeding card is to be deflected. Deflection selectively occurs by incrementing the 80 column card '81 times instead of 80 times. This change in card incrementation also, forms no part of the present invention. As noted in this case, however, by reference to FIGS. 2 and 3 the trailing edge of the card passes beyond the deflected arm contact surface 144 and under the bias of spring 128, the deflector arm pivots clockwise about the axis of pivot pinof mounting pin 98 causing the thin projecting portion 130 of the deflector arm to pivot the deflector about the pivot pin axis a 140 from the dotted line position shown in FIG. 2 to its full line position. It is further noted that the detent or latch 114 is free of the detent portion 144 of the deflector since, the 8lst column increment occurs while the set up arm actuator is in its extreme right-hand position (FIG. 3). Subsequent to incrementing to the 81st column position and release of the deflecting arm, as in the previous mode, the machine calls for a new clutch or cam operation which results in a counterclockwise pivoting of set up arm 106 by movement of the set up arm actuator bar 122 from left to right. This raises contact surface 108 lifting the projection 110 and pressure wheel 94 from the surface of the card and allowing the constantly driven eject roll and its pressure roll to discharge the card from the reader 10. The latch 114 tends to move forwardly to override the detent portion 134 of the deflector 116. However, since the deflector 116 has already pivoted about its pivot pin axis and out of the way of the detent 114, no detent action takes place.

With card gate stop 148 depressed beneath the surface of the card as it moves during. ejection, once the trailing edge of the card moves from beneath the eject roll from between the eject roll and its pressure roll, the trailing portion of the card tends to fall as a result of gravity, but in this case, the right-hand edge of the card contacts the inclined surface 136 of the deflector tending to skew the card clockwise when viewed from its leading edge such that the card falls into the stacker 20 in the second compartment as defined by corner 78.

As mentioned previously, data processing cards of the perforated type for instance, come in varying lengths having for instance columns of information, 51 columns etc. Some card readers are adapted for use with cards of varying lengths such as for instance the illustrated reader of FIG. 1. It is therefore necessary to employ a stacker having the offset memory feature of the presentinvention, whose length may be readily changed, depending upon the size of the cards being processed. Such a card stacker is shown in FIGS. 4 and 5 in which stacker is sectional inform rather than unitary. Stacker 160 comprises a card trailing edge section 162 and a card leading edge section 164 which may be adjustably cou' plecl to provide a stacker having two angularly offset card receiving compartments of adjustable length. In this respect, leading edge section 164 is provided with end wall 166, right- .hand sidewall portion 168 a bottom wallportion 170 and a diverging sidewall portion 172. There are no offset portions to sidewall 172 and it terminates in a straight edge 174. The

sidewall 172 extends somewhatbeyond the leadingedge 176 of bottom wall 170 and has an integrally formed, bent, tab extension 178 at the center thereof. The trailing edge section 162 is provided with astepped end wall 180 having end wall portions 182 and 184 in different planes, a rectangular sidewall portion 186 and a converging, stepped sidewall portion 188. In this respect, the converging sidewall portion 188 includes two sidewall sections 190 and 192 lying in different planes and coupled by right angle end wall 194. A narrow sidewall portion 196 joins end wall portions 182 and 184 in a right angle connection. Thus, there are formed card edge locating corners 198 and 200 respectively for the card entry end wall 180. Section 162 further includes a bottom wall 202 which carries spaced, longitudinally alined, rectangular tab receiving openings or apertures 204 and 206 from end wall l80outwardly. The materials of stacker 160 as well as stacker 20 in the embodiment of FIG. 1 are formed of sheet material such as metal which may be easily stamped to the configuration desired, and the walls may be rigidly attached to each other by soldering, welding, etc. In like manner to the first embodiment, narrow sidewall 196 and end wall section 182 form a corner 198 to define along with sidewall portions 168 and 186 and end wall 166 a nondeflected card receiving compartment. The deflected card receiving compartment within the stacker is defined by sidewall 190, end wall section 184, forming corner 200,1and the common sidewall portions 168 and 186 and end wall 164. Note, however, that the designation of deflected and nondeflected card receiving compartments are determined merely by the position of the stacker with respect to the card feeding apparatus which discharges the same. In like respect to the previous embodiment, it is noted that the diagonal distance from the corner 208 formed by th sidewall portion 168 and end wall 166 to respective corners 200 and 198 are identical to insure entrapment of the card in either the inline or deflected compartment since, the cards cannot move across the right angle corner 210 formed by sidewall and end wall portions 196 and 184 respectively. Dimensions D1 and D2 are identical.

the leading edge section 164 of the stacker is uncoupled by lifting the same and removing tab 178 from its receiving opening 206 and reinserting the tab within opening 204'as indicated in dotted line fashion in FIG. 5. In this case, the forward portion of sidewall 172 overlaps both converging sidewall portions 190 and 192 with edge 174 abutting corner 200. In this case the recoupling and adjustment in size does not affect the position of corner 210 with respect to the on coming cards nor the orientation of the stacker with respect to the card feed mechanism and with the stepped end wall, cards will be received in either of two predetermined position and maintain the same by the presence of the right angle comer 210. Thus, it is essential only to have a stepped end wall and an angulating sidewall to form the separate compartments although care must be taken that the diagonal distance from the pivot point formed by the common corner diagonally toward the junction lines between the angled sidewall and the stepped end wall remains equal and corresponds to a like diagonal dimension of the card receiving the same. it is further noted that the bottom wall 54 of the first embodiment and 154 of the second embodiment of the stacker are inclined toward the card reader delivering the card to facilitate proper stacking of the cards under the gravity feed system.

While the invention has been particularly shown and described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that the foregoing and other changes in form and details may be made therein without departing from the spirit and scope of the invention.

lclaim:

i 1. A card stacker for receiving and maintaining deposited cards in either of offset positions comprising: spaced end walls corresponding to the length of deposited ,cards, first sidewall means defining a side reference for deposited cards, one of said end walls being stepped in a direction toward said other end wall, to the side opposite said first reference sidewall means and at a distance in excess of normal card width, and second sidewall means extending between said one end wall and said end wall stepped portion, said second sidewall means converging in the direction of card entry movement with said converging sidewall and said stepped end wall forming corners characterized by generally equal distances to the common stacker corner diagonally thereacross.

2. Acard stacker as claimed in claim 1 including means for adjustable adjustably positioning the end walls from each other along the longitudinal axis of the stacker to allow stacking of various length cards in either of two positions.

3. A card stacker as claimed in claim 1 further including overlapping bottom walls, one of said bottom walls carrying a plurality of longitudinally spaced apertures and said other bottom wall including 21 depending tab whereby said card stacker bottom wall section may be longitudinally coupled at different positions by inserting said depending tab into a selected aperture.

4. A card stacker as claimed in claim 1 wherein said converging sidewall is stepped intermediate of its length to facilitate depositing of cards in multiple angularly offset positions.

5. In a card feeding mechanism including eject means for causing a discharged card to fall under gravity into either of two angularly offset positions within a card stacker, the improvement comprising actuable deflector means contacting the trailing end of the card during one position for laterally deflecting said cards during movement into said stacker, and means for selectively actuating said deflector means.

6. The card feed apparatus as claimed in claim 5 wherein said deflector means comprises a deflector mounted for pivotable movement about an axis in line with the'direction of movement of the card and to one side of the card edge, a deflector arm for pivoting said deflector about said pivot axis, means tending to move said deflector arm into defle tor operating position and means carried by said deflector arm and responsive to card position for preventing deflector arm movement.

7. The card feeding apparatus as claimed in claim 6 further comprising movable latch means for preventing movement of said deflector and means tending to bias said latch means in latching position whereby, regardless of card position and operation of said deflector arm, said latch means prevents movement of said deflector into card edge deflecting position.

8. The card feeding mechanism as claimed in claim 7 further including; an incrementing wheel for incrementing a card along said feed path, a pressure wheel, a spring biased pressure wheel support tending to bias said pressure wheel into contact with said incrementing wheel, a set up arm maintaining said pressure wheel spaced from said incrementing wheel, means operatively coupling said latch means to said set up arm, and means for simultaneously releasing said latch means and said pressure wheel.

9. The card feeding mechanism as claimed in claim 8 further including; a continuously driven eject roll positioned downstream of said incrementing wheel, a pressure roll continuously biased toward said eject roll, the frictional force exerted by said continuously driven eject reel and its pressure roll being less than the frictional force existing between the pressure wheel and the incrementing wheel, such that, in the absence of movement of said set up arm to force said pressure wheel away from said incrementing wheel, the friction of said eject roll against said card is insufficicntto eject the same.

10. The card feeding mechanism as claimed in claim 9 further comprising a spring biased card gate having a stop portion normally positioned in the path of movement of said cards, and means carried by said set up arm for simultaneously depressing said card gate and removing said latch means from said deflector.

ll. A'card feed apparatus as claimed in claim 10 wherein in the order of card movement, said leading edge of said card passes the card contact surface of the deflector arm, said pressure and incrementing wheel, said card gate, said continuously tOl'.

driven ejector roll and pressure roll, and the card edge deflec UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 926 D d December 1, 1970 Inventoflg) Elwood C. Campbell It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column 2, line 44, after "copending" and before "Pat. insert United States Column 4, line '72, after "incremented" and before "the", insert f1 Column 4, line 75, after "read, delete [Br cam actuation b 7.

Column 5, line 7, after "normal", delete man 7.

Column 5, line l6, after "of" and before "pressure", insert the Column 5, line 19, after "while" and before "card", delete a Column 6, line 6l, after "by"and before "sidewall", delete Column 6, line 64, delete l inling and insert in line Column 6, line 66, delete and insert therefor D'l Column 6, line 67, delete [D21 and insert therefor DZ Claim l, Column 7, line 32, after "of" and before "offset", insert two angularly Claim 2, Column 7, line 45, before adjustably", delete adjustable Signed and sealed this 13th day of April 1971.

(SEAL) Attest:

EDWARRM, PLETCHERJR. WILLIAM E. SCHUYLER, JR.

Attest ng Offlcer Commissioner of Patents FOQM 0-1050 [10-69) 

